NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 817-905 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
— 817-906 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GRAPEVINE TX
— 817-907 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
— 817-909 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
— 817-910 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TEXAS WINDSTREAM, LLC 2153 ACTON TX
— 817-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 817-912 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 GRAPEVINE TX
— 817-913 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
— 817-914 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → GRANDE COMMUNICATIONS NETWORKS, INC. - TX 7670 ARLINGTON TX
— 817-915 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
— 817-916 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORT WORTH TX
— 817-917 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
— 817-918 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 NRICHLDHLS TX
— 817-919 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-920 2XXX3XXX4XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-921 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-922 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-923 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-924 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-925 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-926 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-927 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-928 0XXX1XXX2XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
— 817-929 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-930 not yet reported which blocks → SOUTHWESTERN BELL 9533 GLENDALE TX
— 817-931 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-932 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-934 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C ATLAS TX
— 817-935 0XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-937 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-938 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-939 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-942 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-944 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-946 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
— 817-947 0–9 XXXall 10 · 3 holders which blocks → EXIANT COMMUNICATIONS LLC 114J KENNEDALE TX
— 817-949 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 GRAPEVINE TX
— 817-950 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 817-952 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-953 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
— 817-955 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 817-956 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-957 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-958 not yet reported which blocks → TX
— 817-959 not yet reported which blocks → TX
— 817-961 1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ROANOKE TX
— 817-962 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-963 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-966 not yet reported which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-967 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.